Forward unrecognized OpenAI-compatible generateKwargs keys through extraBody while reserving documented provider control keys such as modelsPath.\n\nVerification:\n- cd mateclaw-server && mvn -pl . test -Dtest=OpenAiCompatibleChatModelBuilderTest,ModelDiscoveryServiceTestPromptTest\n- cd mateclaw-ui && node --max-old-space-size=6144 ./node_modules/vue-tsc/bin/vue-tsc.js --noEmit